using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    using System.Data.SqlClient;

    namespace SqlConect
    {
        public partial class Form1 : Form
        {
            SqlConnection con = new SqlConnection();
            SqlCommand cmd = new SqlCommand();
            public Form1()
        {
            InitializeComponent();
            cmd.Connection = con;       
            con.ConnectionString = @"Data Source=DESKTOP-73VBH0K\SQLEXPRESS;Initial Catalog=FirstSQL;Integrated Security=True";
            con.Open();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            // TODO: This line of code loads data into the 'firstSQLDataSet.Details' table. You can move, or remove it, as needed.
            this.detailsTableAdapter.Fill(this.firstSQLDataSet.Details);
        }
        private void button1_Click(object sender, EventArgs e)
        {
            cmd.CommandText = "Insert Into Details Values ("+textBox1.Text+",'"+textBox2.Text+"','"+textBox3.Text+"',"+textBox4.Text+")";
            cmd.ExecuteNonQuery();
            MessageBox.Show("Record Insert"); 
        }
        private void button2_Click(object sender, EventArgs e)
        {
            cmd.CommandText = "Update Details Set Student_Course = '"+textBox3.Text+"' Where Student_ID ="+textBox1.Text+"";
            cmd.ExecuteNonQuery();
            MessageBox.Show("Record Update");
        }
        private void button3_Click(object sender, EventArgs e)
        {
            cmd.CommandText = "Delete From Details Where Student_ID =" + textBox1.Text + "";
            cmd.ExecuteNonQuery();
            MessageBox.Show("Record Delete"); 
        }
        private void button4_Click(object sender, EventArgs e)
        {
            cmd.CommandText = "Select * From Details Where Student_ID =" + textBox1.Text + "";
            cmd.ExecuteNonQuery();

            SqlDataReader dr;
            dr = cmd.ExecuteReader();

            if (dr.Read())
            {
                textBox1.Text = dr[0].ToString();
                textBox2.Text = dr[1].ToString();
                textBox3.Text = dr[2].ToString();
                textBox4.Text = dr[3].ToString();
            }
            MessageBox.Show("Record Search");
           }
        private void textBox5_TextChanged(object sender, EventArgs e)
        {
            cmd.CommandText = "Select * From Details Where Student_Name Like'%"+textBox5.Text+"%'";
            SqlDataReader dr;
            dr = cmd.ExecuteReader();

            DataTable dt = new DataTable();
            dt.Load(dr);

            dataGridView1.DataSource = dt;
            dataGridView1.Refresh();
        }
    }   
}